U.S. stocks closed lower Monday, as investors worried whether Cyprus could set a precedent for other debt strapped eurozone nations.

Cyprus struck a deal with European negotiators early Monday that will mean big losses for account holders with more than €100,000 at the two biggest banks -- the Bank of Cyprus and Popular Bank of Cyprus.

Investors had largely dismissed Cyprus' bailout as confined to the tiny island nation. But investors got spooked after the head of the Eurogroup of eurozone finance ministers, Jeroen Dijsselbloem, told Reuters that what happened in Cyprus could be a model for bailouts throughout the EU.

Dijsselbloem later issued a statement rebutting those comments, saying Cyprus was "a specific case with exceptional challenges." He also noted that economic plans are "tailor made" for the country involved, and "no models or templates are used."

Still, investors had trouble forgetting the idea that Cyprus could set a precedent once it was circulated.

Fitch Ratings said it was "alert to the precedent this may set for further forms of capital controls within the eurozone."

The Dow had hit a new intraday record high shortly after the open, and the S&P 500 nearly topped its all-time closing high before Dijsselbloem's comments.

"Once you deal with the banking system in Cyprus, you need to address the rest of the periphery in Europe," said Paul Powers, a managing director at Raymond James. "It reminds people how fragile the rest of the system can be."

Aside from Cyprus, Dell(DELL) shares jumped nearly 3%, after the PC maker said early Monday that it had received two competing bids to founder Michael Dell's buyout offer. Both Carl Icahn's Icahn Enterprises(IEP), and Blackstone Grou(BX)p submitted separate buyout offers, which Dell said may turn out to be superior.

Tesla's(TSLA) stock surged in late trading, after CEO Elon Musk tweeted that a "really exciting @TeslaMotors announcement" would be "coming on Thursday."

Shares of Apollo Group(APOL) rallied 7%, after the education company reported earnings that blew past estimates, even as enrollment at University of Phoenix declined nearly 16%.

Zero hope for BlackBerry?

BlackBerry(BBRY) continued to come under pressure, after its new Z10 phone received a lukewarm reception by U.S. consumers. Goldman Sachs also downgraded the smartphone maker to neutral, calling the U.S. launch "disappointing."